Friedrich trabert



(No Model.)

F. TRABERT.

OENTERING. I No. 431,628. Patented July 8, 1890.

"m: Nunms PETERS 120., mow-mum, vusumo'ron, n. c.

V UNITED STATES PATENT OFFICE.

FRIEDRICH TRABERT, OF RATHENOW, GERMANY.

. CENTERING.

SPECIFICATION forming part of Letters Patent No..431,628, dated July 8,1890.

Application filed September 23, 1889. Serial No. 324,863. (No model.)

To all whom it may concern:

Be it known that I, FRIEDRICH TRABERT, a subject of the German Emperor,residing at Rathenow, in Germany, have invented a new and usefulImprovement in Centering, of which the following is a specification.

This invention relates to adjustable centering, and is represented inthe annexed drawings in Figures. 1 to 4. The centering is adjustable andthe pitch regulated automatically.

Figs. 1 and 2 show centers completely drawn together in side View andplain vew. Fig. 3 represents the same center partly drawn out in sideview, and Fig. 4 is aview of the partlydrawn-out center withvaultremoved.

The centering consists of the vault-rails c c and of the tie-rails 1) N,which are journaled at their ends into a pair of cheeks d d and d d. Thetie-rails b b are securely riveted to the cheeks d d, and the guides band b on the inner ends of these rails are so arranged that the guidebgrasps the rail b and the guide b does likewise with the rail 7), Figs.1, 3, and 4. The rail 1)? has holes at certain intervals, and the rail bis likewise provided at a with. a hole for inserting a pin 0*, attachedto D through a and into a correspondin'g'hole at b according to the spanrequired. The outer ends of the vault-rails c and c rest on and betweenthe cheek-pins d and d and are secured at a by pin 1" and at a by pin0". Instead of the pins, screws may be used for securing the vault-railsbetween the cheeks, in which case the holes should be provided withcorresponding worms. The

guides existing at the inner end ofthe vaultrails are so arranged thatthe guide 0 of the rail 0 grasps the vault-rail c ,and the guide 0 ofthe vault 0 holds the vault-rail 0, Figs. 1 The spikes s and .9,arranged at the vault-rails c and 0 are for the correct erection of thecentering-pieces and serve for holding them together. The cheek-pairs dand d are provided at the upper ends with projecting flaps e and e,which rest upon the abutments of the girders.

The use of the described centering is as follows: After the pin r hasbeen withdrawn from the rails 12 and b the centers are adjusted for thecorrect span of arch by shifting the rails 19 and b and c and 0respectively, and are then fixed by the pin r which is inserted throughthe hole a of the rail b and through the corresponding hole ofthe railb, when the pitch regulates itself automatically in the proportion oftwelve to one as the vault-rails c and c are movable on the pins 1'',Fig. 1, and screws 0'', Fig. 3, and when, for instance, an arch is to beexecuted between iron supports, the vault-centers with their flaps e eand e eare suspended at the flanges of the iron girders and are adjusted by the plummet,

and the connection of the centers between themselves is effected'by twolathes L, which are driven into the spikes s and s, fixed on the rails cand 0 The lathes, which are further necessary, are equally distributedover the arches.

I claim The adjustable bearers c 0 with their spikes s s, and thetie-rails 1) W, with their jaws I), together with the cheeks d d and dd, all substantially as illustrated and described, for the purposes setforth.

In testimony whereof I have signed this specification in presence of twosubscribing witnesses.

FRIEDRICH TRABERT.

Witnesses:

JULIUS MAAss, HERMANN BRANDT.

